PuTTY 0.61 is out, after over four years , with new features, bug fixes, and compatibility updates for Windows 7 and various SSH server software.

PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator

These features are new in beta 0.61:

Kerberos/GSSAPI authentication in SSH-2. Local X11 authorisation support on Windows. (Unix already had it, of course.) Support for non-fixed-width fonts on Windows. GTK 2 support on Unix. Specifying the logical host name independently of the physical network address to connect to. Crypto and flow control optimisations. Support for the zlib@openssh.com SSH-2 compression method. Support for new Windows 7 UI features: Aero resizing and jump lists. Support for OpenSSH AES-encrypted private key files in PuTTYgen. Bug fix: handles OpenSSH private keys with primes in either order. Bug fix: corruption of port forwarding is fixed (we think). Bug fix: various crashes and hangs when exiting on failure, Bug fix: hang in the serial back end on Windows. Bug fix: Windows clipboard is now read asynchronously, in case of deadlock due to the clipboard owner being at the far end of the same PuTTY's network connection (either via X forwarding or via tunnelled rdesktop)